Must declare the scalar variable "@SearchCity"

I am attempting to fill the schema in a data set and keep getting a "Must declare the scalar variable "@SearchCity". The problem is that I think I have already defined the variable. Can anyone see what I am missing. Here is my code.

I may be going blind in my old age, but there is no definition shown above for the "SearchProviderIns", can you please show this. I suggect this is probably needing a parameter called @SearchCity, but you are not providing it.

Introduction
This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…

This article is for Object-Oriented Programming (OOP) beginners.
An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…